Vibrating screen



May 3,` 1938. H. L. sTRUBE 2,116,225

VIBRATING SCREEN Filed July 11, 19:56 2 Sheets-Sheet 2 Patented May 3,1938 UNITED STATES PATENT OFFICE l Link-Belt Company, tion of IllinoisApplication July 11,

Claims.

My invention relates to an improvement in screens and has for onepurpose the provision of an improved screen box or screen body member.

Another purpose is the provision of a screen' 5 box which includes aplurality of superposed box or screen elements, removably securedtogether, whereby a multiple deck screen may be assembled.

Another purpose is the provision of improved means for securing twosuperposed screen boxes together.

Other objects will appear from time to time in the Vcourse of thespeciiication and claims.

I illustrate my invention more cr less diagram- 4 I5- matically in theaccompanying drawings wherein:

Figure 1. is a side elevation;

Figure 2 is an end elevation with partsv in section; and l 4Figure 3 isa plan view with parts broken away.

Like parts are indicated by like symbols throughout the specication anddrawings.

Referring to the drawings, I generally indicates any suitable basemembers or supports, herein indicated as the longitudinally extendingwood beams which may be supported on any suitable uprights 2. Mountedupon each of the longitudinally extending base members I, I illustratebrackets generally indicated as 3, each of which includes bottomabutting flanges 4 through which pass securing bolts 5, and upright endportions screen box. The side frame members are shown 50 are shown asoutwardly anged as at 23. Mounted in the brackets 22 is any suitablevibratory structure herein shownas a rotor shaft 24 carrying a pulley25, preferably adjustable unbalanced members 2'6, and an eccentricportion 2l. 28 is t' any suitable housing connecting the brackets 22This extension is illustratedA Chicago, Ill., a corpora- 1936, SerialNo. 90,048

and surrounding main extensions of the rotor. Any suitable transverse orcross members 30 are provided to connect the side frame members 20 ofthe screen'box.

I may, for example, employ angle members, some extending from side toside of therframe and others, as at 3l, extending only part way acrossthe screen frame. 32 indicate any suitable angle brackets, boltedthereto, which carry longitudinally extending supports 33 over whichscreen cloth 34 may be tensioned. 'I'he cloth actually engages rubbercovered portions or pads 35. 36 indicates any suitable horizontal shelfor flange upon which the edges of the screen cloth 34 are received. 31indicates clamping members having a lower flange 38 hooked into the'edgeof the screen clothand an upper flange 3B opposed, as a tiltingabutment, to the inner face of the side frame member 2U.

' 40 indicates av screen tensioning bolt headed as at 4l and extendingthroughthe member 31, andexteriorly through the side frame member 2B. 42is a wedge-shaped exterior abutment adapted to' be engaged by a nut 43or any-other suitable-means for drawing the lower flange 38 of themember 3l inwardly toward the inner face of the side frame member 20,whereby to tension the screen cloth* The upper edge of the lower screenbox member, as shown for example in Figure 2, is downwardly and inwardlyinclined as at 50, in opposition to the'outer lower face of the downwardand inward extension 2l of the side frame member 20 of the upper screenbox. The two parts may be secured together as by bolts 5I.

As will be clear from Figure 2, assuming that the upper screen box ismounted upon supporting springsl 8, one or more lower screen boxes maybe quickly and easily secured to or removed from it. All that isnecessary is to oppose the portions 5D' of the lower box to the portions2l of the upper box and then thread the bolts 5I through and tightenthem up. The inclined portions 2l of the frame members 28 may all beapertured as at 52,-in readiness for the addition of additional screenboxes.

Whereas I have shown the supporting springs as secured to the-upper of apair of screen boxes, it will be understood that two or more additionalscreen boxes may be secured to the original one. It will be alsounderstood that, with very slight modification of the parts, theadditional decks or boxes could be positioned above the screen box whichis actually secured to the springs.

It will be realized that, whereas I have described and illustrated apractical and operative device, nevertheless, many changes may be madein the size, shape, number and disposition of parts without departingfrom the spirit o! my invention. I therefore wish my description anddrawings to be taken as in a broad sense illustrative or diagrammatic,rather than as limiting me to the precise showing.

I claim: l i 1. In a vibratory screen, a screen box includ ing aplurality of separable, superposed' box members, a base for said screen,a flexible connection between said base and one of said box members,means for removably securing said box members together, includingopposed downwardly and inwardly extending portions conforming to eachother, one associated with the lower edge of the upper of two adjacentboxes, and the other associated with the upper edge of the lower. ofsaid two adjacent boxes, and means for securing` said opposed portionstogether, said portions and securing means lying entirely within theperiphery of the screen boxes.

2. In a screen box structure, a plurality of superposed separable screenboxes, eachincluding side, framemelements and connecting cross saidopposed portions, said securing means and ilanges lying entirely withinthe periphery of the screen boxes.

3. In a vibratory screen, a screen box having parallel side framemembers, each said side frame member having an outwardly extendingflange along its upper edge and an inwardly extending iiange along itslower edge, vibratingv means mounted -on said upper flanges, anadditional screen box having inwardly extending flanges opposed to theinwardly extending flanges of the first mentioned screen box, and meansfor securing said opposed inwardly extending anges together, saidflanges and securing means lying entirely within the peripheries of thescreen boxes, a screeni'abric mounted in the second screen box, meansfor holding the fabricA in'position, such means beingA located below andmasked by the inwardly extending ilanges.

4. In a vibratory screen, a screen box having screen box having inwardlyextending anges l opposed to the inwardly extending flanges of the firstmentioned screen box, and means for securing said opposed inwardlyextending flanges together, said ilanges and securing means lyingentirely withinA the peripheries of the screen boxes, said inwardlyextending flanges being downwardly and inwardly inclined.

5. In a vibratory screen, a screen box having parallel side framemembers, each said side frame member having an inwardly extending ilangealongits lower edge, an additional screen box having inwardly extendingflanges opposed to the inwardly extending flanges of the firstmentioned'screen box, means for securing said opposed inwardly extendingilanges together, screen mesh mounted on the lower screen box, andsecuring means therefor positioned beneath and vertically alined with'said inwardly vextending flanges, a screen vfabric mounted in the secondscreen box, means forholding the fabric in position, 4such means beinglocated below a'nd'

